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HYPOXIA - PowerPoint PPT Presentation


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HYPOXIA. A condition where the water becomes so low in dissolved oxygen content (<2mg/L) that most higher forms of life can not survive. Caused by poor mixing within the water column and / or decomposition of organic matter. HYPOXIA. There are natural hypoxic regions

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hypoxia
HYPOXIA
  • A condition where the water becomes so low in dissolved oxygen content (<2mg/L) that most higher forms of life can not survive.
  • Caused by poor mixing within the water column and / or decomposition of organic matter.

Hypoxia

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HYPOXIA
  • There are natural hypoxic regions
    • Western coasts of continents
    • Fjords
    • center of the Black Sea
  • In ocean waters the most limiting nutrient is nitrogen.

Hypoxia

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HYPOXIA
  • The worst hypoxic conditions are in the Baltic Sea and the Black Sea
  • Hypoxic conditions have been increasing since the 1960’s
  • The Gulf of Mexico, outside the delta of the Mississippi River is the worlds third largest hypoxic area
  • 12400 sq. km. (4800 sq. mi)

Hypoxia

gulf of mexico hypoxia
GULF OF MEXICO HYPOXIA
  • Nitrogen export from the Mississippi River has increased 2- to 7-fold over the last century
  • Nitrogen losses from ag-land in the basin are by air, surface runoff, sediment transport and subsurface drainage.
  • Losses of about 1.8 million Mg / yr

Hypoxia